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Commitments and Contingencies (Changes To Warranty Liability) (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Movement in Standard Product Warranty Accrual [Roll Forward]    
Warranty liabilities, beginning of period $ 72,709 $ 66,134
Reserves provided 11,916 10,643
Payments (14,282) (12,099)
Other adjustments 643 3
Warranty liabilities, end of period $ 70,986 $ 64,681